In vivo rapid magnetic field measurement and shimming using single scan differential phase mapping
In vivo rapid magnetic field measurement and shimming using single scan differential phase mapping
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DOI：
10.1002/mrm.1910360421
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发表时间：
1996-10-01
影响因子：
3.3
通讯作者：
Satoh, K
中科院分区：
文献类型：
--
作者：
Kanayama, S;Kuhara, S;Satoh, K
体内匀场是减轻 MRI 中与受试者相关的磁场畸变的有力工具，尽管通常冗长的程序限制了其使用。开发了一种称为单扫描差分相位映射的磁场测量方法，当与多重梯度回忆回波成像一起使用时，可以将传统方法的测量时间减少一半以上。在商业 MRI 系统中实现了使用本方法的自动高阶匀场，研究了体内场不均匀性特征和匀场性能。人们发现该方法对于提高平面回波图像的质量很有用。
In vivo shimming is a powerful tool for alleviating subject-dependent magnetic field distortions in MRI, although the usually lengthy procedure has limited its use, A magnetic field measurement method called single scan differential phase mapping that can reduce the measurement time of conventional methods by more than half when used with multiple gradient-recalled echo imaging was developed, An automatic high-order shimming using the present method was implemented in a commercial MRI system, In vivo field inhomogeneity features and the shimming performances were investigated. The method was found to be useful for improving the quality of echo-planar images.